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Finding the Fourth Proportional to 18,361.78, 25,342.92 and 11,655.40

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Solution

The fourth proportional to 18,361.78, 25,342.92 and 11,655.40 is: 16,086.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,361.78 : 25,342.92 = 11,655.40 : x
  2. Step 2: Convert to fraction form
    18,361.78/25,342.92 = 11,655.40/x
  3. Step 3: Cross multiply
    18,361.78x = 25,342.92 × 11,655.40
  4. Step 4: Simplify right side
    18,361.78x = 295,381,869.77
  5. Step 5: Solve for x
    x = 295,381,869.77/18,361.78
  6. Step 6: Final answer
    x = 16,086.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.